1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * (C) Copyright 2020 Hewlett Packard Enterprise Development LP
7 * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
8 */
9
10 /*
11 * Cross Partition (XP) uv-based functions.
12 *
13 * Architecture specific implementation of common functions.
14 *
15 */
16
17 #include <linux/device.h>
18 #include <asm/uv/uv_hub.h>
19 #if defined CONFIG_X86_64
20 #include <asm/uv/bios.h>
21 #endif
22 #include "../sgi-gru/grukservices.h"
23 #include "xp.h"
24
25 /*
26 * Convert a virtual memory address to a physical memory address.
27 */
28 static unsigned long
xp_pa_uv(void * addr)29 xp_pa_uv(void *addr)
30 {
31 return uv_gpa(addr);
32 }
33
34 /*
35 * Convert a global physical to socket physical address.
36 */
37 static unsigned long
xp_socket_pa_uv(unsigned long gpa)38 xp_socket_pa_uv(unsigned long gpa)
39 {
40 return uv_gpa_to_soc_phys_ram(gpa);
41 }
42
43 static enum xp_retval
xp_remote_mmr_read(unsigned long dst_gpa,const unsigned long src_gpa,size_t len)44 xp_remote_mmr_read(unsigned long dst_gpa, const unsigned long src_gpa,
45 size_t len)
46 {
47 int ret;
48 unsigned long *dst_va = __va(uv_gpa_to_soc_phys_ram(dst_gpa));
49
50 BUG_ON(!uv_gpa_in_mmr_space(src_gpa));
51 BUG_ON(len != 8);
52
53 ret = gru_read_gpa(dst_va, src_gpa);
54 if (ret == 0)
55 return xpSuccess;
56
57 dev_err(xp, "gru_read_gpa() failed, dst_gpa=0x%016lx src_gpa=0x%016lx "
58 "len=%ld\n", dst_gpa, src_gpa, len);
59 return xpGruCopyError;
60 }
61
62
63 static enum xp_retval
xp_remote_memcpy_uv(unsigned long dst_gpa,const unsigned long src_gpa,size_t len)64 xp_remote_memcpy_uv(unsigned long dst_gpa, const unsigned long src_gpa,
65 size_t len)
66 {
67 int ret;
68
69 if (uv_gpa_in_mmr_space(src_gpa))
70 return xp_remote_mmr_read(dst_gpa, src_gpa, len);
71
72 ret = gru_copy_gpa(dst_gpa, src_gpa, len);
73 if (ret == 0)
74 return xpSuccess;
75
76 dev_err(xp, "gru_copy_gpa() failed, dst_gpa=0x%016lx src_gpa=0x%016lx "
77 "len=%ld\n", dst_gpa, src_gpa, len);
78 return xpGruCopyError;
79 }
80
81 static int
xp_cpu_to_nasid_uv(int cpuid)82 xp_cpu_to_nasid_uv(int cpuid)
83 {
84 /* ??? Is this same as sn2 nasid in mach/part bitmaps set up by SAL? */
85 return UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpuid));
86 }
87
88 static enum xp_retval
xp_expand_memprotect_uv(unsigned long phys_addr,unsigned long size)89 xp_expand_memprotect_uv(unsigned long phys_addr, unsigned long size)
90 {
91 int ret;
92
93 #if defined CONFIG_X86_64
94 ret = uv_bios_change_memprotect(phys_addr, size, UV_MEMPROT_ALLOW_RW);
95 if (ret != BIOS_STATUS_SUCCESS) {
96 dev_err(xp, "uv_bios_change_memprotect(,, "
97 "UV_MEMPROT_ALLOW_RW) failed, ret=%d\n", ret);
98 return xpBiosError;
99 }
100 #else
101 #error not a supported configuration
102 #endif
103 return xpSuccess;
104 }
105
106 static enum xp_retval
xp_restrict_memprotect_uv(unsigned long phys_addr,unsigned long size)107 xp_restrict_memprotect_uv(unsigned long phys_addr, unsigned long size)
108 {
109 int ret;
110
111 #if defined CONFIG_X86_64
112 ret = uv_bios_change_memprotect(phys_addr, size,
113 UV_MEMPROT_RESTRICT_ACCESS);
114 if (ret != BIOS_STATUS_SUCCESS) {
115 dev_err(xp, "uv_bios_change_memprotect(,, "
116 "UV_MEMPROT_RESTRICT_ACCESS) failed, ret=%d\n", ret);
117 return xpBiosError;
118 }
119 #else
120 #error not a supported configuration
121 #endif
122 return xpSuccess;
123 }
124
125 enum xp_retval
xp_init_uv(void)126 xp_init_uv(void)
127 {
128 WARN_ON(!is_uv_system());
129 if (!is_uv_system())
130 return xpUnsupported;
131
132 xp_max_npartitions = XP_MAX_NPARTITIONS_UV;
133 #ifdef CONFIG_X86
134 xp_partition_id = sn_partition_id;
135 xp_region_size = sn_region_size;
136 #endif
137 xp_pa = xp_pa_uv;
138 xp_socket_pa = xp_socket_pa_uv;
139 xp_remote_memcpy = xp_remote_memcpy_uv;
140 xp_cpu_to_nasid = xp_cpu_to_nasid_uv;
141 xp_expand_memprotect = xp_expand_memprotect_uv;
142 xp_restrict_memprotect = xp_restrict_memprotect_uv;
143
144 return xpSuccess;
145 }
146
147 void
xp_exit_uv(void)148 xp_exit_uv(void)
149 {
150 WARN_ON(!is_uv_system());
151 }
152